If an update has been found for the LG smartphone, it will be automatically downloaded from the factory. If the device is also not in use at midnight, the update will also be automatically installed overnight. If this is not desired, the auto installation can also be deactivated.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Update center
Step 4:  Tap on  Software Update
Step 5:  Open the  Menu
Step 6:  Open the  Settings
Step 7:  Enable or Disable  Automatic updates
  1. Open the Settings
  2. Tap on General
  3. Tap on Update center
  4. Tap on Software Update
  5. Open the Menu
  6. Open the Settings
  7. Enable or Disable Automatic updates

LG Instructions